Kenwood KRC-366, KRC-466, KRC-566 Service Manual

CASSETTE RECEIVER

KRC-366/466/566

SERVICE MANUAL

Mechanism extension cord : W05-0477-00 (7P), W05-0609-00 (10P)

SRC

OFF

DC cord (E30-4784-05)or (E30-6131-05)

KRC-XXXX

LOUD SCAN REP M.RDMB.S/RDM ADJ AUTO AMECLK

Plastic cabinet assy (A02-1486-13)

Mounting hardware assy (J21-9716-03)

45Wx4

Panel assy (A64-2939-02) : KRC-366 (A64-2940-02) : KRC-566 (A64-2943-02) : KRC-466

DISC

CRSC

Lever (D10-4589-04)

AUD

x2

Remote controller assy (A70-2024-05)

Screw set (N99-1610-15)

Depends on model. Refer to the parts list.

Screw set (N99-1719-05)

Escutcheon (B07-3001-02) : KRC-366 (B07-3022-02) : KRC-466/566

2

SW5V

B.U.14V

BU5V

BU14V

FM ANT AM ANT

FM+B AM+B

PLL+B

PLL-DATA

VT

IFC OUT

PLL-CLK

VDD 5V

IF2+B

IF1 GND

S-METER

IF1+B

SD

AUDIO OUT

PLL-DATA

SD S-METER

SUB+ SUB-

EN2

ACC-DET

EN1

SCL

MUTE

SDA

EN3

SW5

PC-DET

PA-DET

PANEL

HOLD

L-CLK

L-CE

L-DATA S

L-DATA L

MUSIC

∗

DOLBY

∗

MTL

EQ-MUTE

MS-CONT

MUSIC

∗

DOLBY

∗

MTL

EQ-MUTE MS-CONT

DSI

FWD/REV

PACK IN

M-STBY

CH CON

DATA H

DATA C

REQ H

REQ C

CH CLK

Rch

COM

Lch

MP IN

AM MPX

OUT RR

SW5V

OUT LR

OUT RF

LEVEL

SCL

SDA

OUT LF

SVR

MUTE

EN1 EN2 EN3

P.ANT

P,CON

ILLUM B.U.5V

AM+B AUDIO

FM+BFM+B

AM+B

AUDIO 8V

BU5V

Rch

Lch

PACK

T-END

M-STBY

T-MODE

FWD

REV

BU5V

AUDIO 8V

BU14V

CHRST

SMUTE

FM+B AM+B

AUDIO 8V

AUDIO

8V

MOTOR

BU14V

SW5V

8

4

1040

IN

PLAY HEAD

BU5V

PLL-CLK

T-MODE

T-END

BU5V

REMO

SW5V

BU-DET

P-STBY

SVR

P-MUTE

CHMUTE

STBY

CD L/R

TAPE L/R

1200mV

400mV

170mV

340mV

TAPE CD-CH

AM

FM

: 1719mV : 3424mV

: 550mV

: 1727mV

TAPE CD-CH

AM

FM

:1780mV :3546mV

:570mV

:1789mV

AUDIO 8V

TAPE L/R

(X16)

(X14)

MM

TUNER

TAPE MECHA

SW5

SYSTEM u-COM

KEY

PAN 5V

MUTE

B.U. DET

SURGE-DET

PA-DETPC-DET

B.U.

ACC

P-CONT

ANT-CON

MUTE

DC CONNECTOR

PRE

POWER IC

EQ AMP

E-VOL

CD/MD CHANGER

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

REGULATOR

LCD DRIVER

LCD

MAIN

SUB

F-Lch

F-Rch

R-Lch

R-Rch

PRE OUT

J5/J6

J4

SP OUT

MOTOR

5V

D301

IC6

IC5

IC1

IC2

IC7

TH1

IC10

IC2

AVR

DSI

REMO

RST SW

PAN IN SW

ACC DET

J2

VOLTAGE

DRIVER

AMP

SVR

PC-DET PA-DET

MUTE

THERMO PROTECTION

MAIN M

DRIVER

SUB MOTOR

ANT.

KRC-366/466/566

BLOCK DIAGRAM

KRC-366/466/566

COMPONENTS DESCRIPTION

● SYNTHESIZER UNIT (X14-6880-2x)

Ref. No. Function Operation

IC1 System µ-com Controls FM/AM tuner, the change, cassette mechanism, volume and tone. IC2 E-volume Controls the source, volume, tone and FM multiplex detector. IC4 Power amplifier Amplifies the front L/R and the rear L/R to 45W maximum. IC5 Equalizer amplifier Equalizes the tape sound. IC6 Sub motor driver Controls the sub motor. IC7 Power supply B.U. : 5V, AUD : 8V, FM+B : 8V, AM+B : 8V. IC10 Mute control logic Controls muting.

Q10 Backup detection

Q11 Surge detection

Q41 Pre mute driver When input becomes “L” output becomes “H” (Preout mute).

Q50 5V SW

Q51 Power antenna detection

Q52 P. CON detection Output becomes “H” when P. CON output is short-circuited (P. CON off).

Q190 Panel SW

Q191 DSI driver

Q221~224 Pre mute Works when input becomes “H”. Being cancelled when input becomes “L”. Q251 SVR “L” when input becomes “H”. Q501 Sub motor AVR Outputs 7.3V when AUD 8V exists. Output does not exist when AUD 8V does not exist. Q551 Main motor SW Outputs 14V when input becomes “L” (Main motor drives). Q552 Main motor SW Output becomes “H” when input becomes “L”.

Output becomes “L” when the backup voltage becomes more than 9V. Output becomes “H” when the backup voltage becomes less than 9V (momentary power down). Output becomes “L” when the backup voltage becomes more than 18V (Momentary power down). Output becomes “H” when backup voltage becomes less than 18V.

Outputs 5V to the SW 5V power supply when input becomes “L”. SW 5V power supply line is cut off when the input becomes “H”. Output becomes “H” when P-ANT output is short-circuited (P-ANT off). Output becomes “L” when FM/AM signal does not exist.

Outputs 5V to the panel VDD line when panel is attached. Panel VDD line is cut off when panel is taken out. DSI lights when input becomes “L”. DSI turns off when input becomes “H”. DSI turns on and off when panel is taken off.

● SWITCH UNIT (X16-1520-2x)

Ref. No. Function Operation

IC1 LCD driver Scans LCD display control key. IC2 Remote sensor Sensors remote controller signal. Q1 Key scan SW Scans key after receiving imitative key input signal.

3

KRC-366/466/566

MICROCOMPUTER’S TERMINAL DESCRIPTION

● Microcomputer : LC72366-9996 (X14 : IC1)

Pin No. Pin Name I/O Function

1 X IN I Clock 4.5MHz. 2 GND - GND. 3 L-DATA L I LCD driver data. 4 L-DATA S O LCD driver data. 5 L-CLK O LCD driver clock. 6 L-CE O LCD driver chip enable. 7 PANEL I Panel detection. 8 PLL-DATA I/O Tuner data. 9 PLL-CLK O Tuner clock. 10 SD I Tuner band muting. 11 CH-DATA C I 5-line CD-CH communication data. 12 CH-DATA H O 5-line CD-CH communication data. 13 CH-CLK I/O 5-line CD-CH communication clock. 14 CH-REQ C I 5 15 MOTOR O Cassette mechanism main motor. 16~20 - - 21 CH-CON O 5-line CD-CH communication control. 22 CH-REQ H O 23 MUTE O Muting. 24 IC2-SCL O IC2 clock. 25,26 - - 27 IC2 TYPE 0 I Model discrimination. 28 - - 29 TYPE 1 I Destination discrimination. 30 TYPE 0 I Destination discrimination. 31 VDD - Power supply. 32 IC2-SDA I/O IC2 data. 33 SW 5V O SW 5V control. 34 P-MUTE O Power IC muting. 35 P-STBY O Power IC standby. 36 SVR O Power IC discharge control. 37 EN1 O Pow er supply IC control. 38 EN3-1 O Power supply IC control. 39 EN3-0 O Power supply IC control. 40 EN2-1 O Power supply IC control.

-line CD-CH communication request.

5-line CD-CH communication request.

Pin No. Pin Name I/O Function

41 EN2-0 O Power supply IC control. 42 - - 43 MS-CONT O Tape signal sensitivity switch. 44 BEEP O Beep. 45 BU-DET I Backup detection. 46 P. CON-DET I 47 P. ANT-DET I 48 MUSIC I Tape signal detection. 49 METAL O Normal/Metal tape switch. 50 DOLBY O Dolby switch. 51 EQ-MUTE O Tape equalizer muting. 52 FWD/REV I 53,54 - - 55 PACK-IN I Cassette mechanism pack-in. 56 REMOTE I Remote signal shape. 57 - - 58 DSI O Disable system indicator. 59 SUB+ O Cassette mechanism sub motor. 60 SUB- O Cassette mechanism sub motor. 61,62 - - 63 IC2 TYPE 1 I Model switching. 64 T-MODE I Cassette mechanism mode pulse. 65 ACC-DET I ACC detection. 66 S-METER I Tuner signal meter. 67 HOLD I Clock stop mode. 68 VDD - VDD. 69 M-STBY I Cassette mechanism standby. 70 T-END I Cassette mechanism end. 71,72 - - 73 VDD - VDD. 74~76 GND - GND. 77,78 - - 79 GND - GND. 80 X OUT O Clock 4.5MHz.

Power control short-circuited detection. Power antenna short-circuited detection.

Cassette mechanism running direction.

4

KRC-366/466/566

ADJUSTMENT

BALANCE/FADER/BASS/TREBLE : CENTER T. ADV/METAL/DOLBY NR/AUTO : OFF

No. Item Input Output Receiver Alignment Align For Fig.

Settings Settings Settings Points

FM Section

While holding preset “1” key, press and hold preset “6” key

98.1MHz

1SD

AM Section

(1) SD

Cassette Deck Section

1 AZIMUTH

DOLBY Connect an VR1 (L ch)

2 (PLAYBACK TCC-130 AC voltmeter TAPE PLAY VR2 (R ch) 300mV

LEVEL) to CN5 (X14-) (X14-)

0 dev

35dBµ

(ANT input) (7 seg model :

990kHz

0% mod

35dBµ

(ANT input) (7 seg model :

TCC-153 Head azimuth screw

10kHz

–FM

–AM

SP OUT TAPE PLAY

TEST MODE : ON

98.1MHz

TEST MODE : ON

990kHz

Preset “1” key, and “ADJ OK” is good.

preset “6” key “ADJ NG” is not good.

Preset “1” key, and “ADJ OK” is good.

preset “6” key “ADJ NG” is not good.

(FWD/REV)

for a few seconds.

“1111” is good. “0000” is not good.)

While holding preset “1” key, press and hold preset “6” key for a few seconds.

“1111” is good. “0000” is not good.)

Adjust so that output level in

playing “FWD” and “REV” (a) becomes maximum each.

TEST MODE : ON While holding the “FM” key and preset “6” key, reset the unit. TEST MODE : OFF Reset the unit.

(a) AZIMUTH

FWD

REV

PANEL FRONT

5

A B C D E

LG

R

R198

C535

R199

W49

W201

W101

W6/L306

W202

R301

W37

W56

R253 R252

R251

R254

C56

R14

R15

W36

W82

W87

W83

W70

W89

W110

W113

W80

W25

W77

W26

W27

W59

W60

W57

W44

W42

W58

W61

W18

W43

W41

W50

W40

W85

W86

W68

W66

W62

W1

W3

W109

W118

W64

W19

W108

W121

W124

W96

W117

W7

W97

W20

W39

W8

W9

W11

W15

W106

W48

W69

W93

W94

W98

W92

W71

W99

W55

W17

W45

W104

X1

R537

W29

R20

R552

R194

R535

R193

R402

R404

R401

R197

R230

R229

R232

R231

R22

R21

R2

R1

R411

R405 R407

R406

R409 R410

R408

R122

R113

R121

R146

R137

R150

R141

R133

R551

R224

R223

R222

R221

R257

R50

R101

R104

R10

L301

C1

L307

L201

L101

C224

C255

C257

C223

C513

C221

C222

C258

C503

C504

C507

C509

C505

C401

C402

C518

C203

C514

C517

C403

C305

C53

C301

C51

C52

C54

C55

C50

C309

C110

C201

C57

C501

C256

C254

C253

C251

C252

L1

W30

W10

W107

W102

W114

W81

W32

W28

W65

W51

W35

W31

W2

W4

W5

W12

W13

W14

W16

W22

W33

W75

W24

W38

W23

W63

W122

W115

W119

W112

W105

W103

W111

W73

W78

W100

W95

W123

W84

W74

W76

W79

W54

W34

W125

W21

W90

W120

4.5MHz

R403

VR2VR1

R52

R53

16

1

9

8

1

224

25

1576109

234813 11 12

1

24

7

1

13

1

214

15

1

10

13

1

2

12

EB

P1

D411

D108

D106

D301

D11

D103 D102

D409

D408

D251

D252

D253

D201

D5

D4

D2

D3

D551

D1

J3

J1

J2

Q551

D401

D402

D10

D20

D403

D407

D405

D404

IC4

J4

J5

J6

A1

X14-6880-2x (J74-1320-02)

CN1

CN5

CN2

IC7

R123

C214

W507

W505

W510

W502

C215

C213

C216

C104/R106

C226 C227

R159

R160

W509

R151

R152

W511

R108

W503

C536

W506

R501

R109

R519

R520

C533

R522

R521

W504

R256

C207

R258

C534

R553

W508

TH1

R555

R533

R202

R196

C204

C205

R131

R183

R181

R184

R142

R143

R186

R185

R111

R112

R162

R148

R138

R145

R147

W501

R136

R139

R149

R132

R161

R144

R134

R187

R504

R503

R502

R512

R511

R505

R415

C20

R532

R524

R523

C14

R534

R515

R514

R513

R518

R517

R516

R225

R228

R227

R226

R201

R188

R203

R261

R260

R259

R412

R262

R255

C101

C102

W512

C208

C506

C520

C508

C111

C502

C532

C308

C404

R23

R51

R11

R12

R13

R105

R107

R102

R103

C511

C512

C516

C206

C519

C515

C41

C209

C211

C210

C225

W513

C202

R57

R56

R16

C217

C212

C330

C331

C64

C63

R55

R54

C103

EB

BE

EB

EBEB

5

1

106

64

41

1

24

65

80

25

40

1

10

21

30

20

11

40

31

114

15 28

71

148

Q501

IC6

Q224

Q223

Q552

Q251

Q222

Q10

Q191

Q221

Q41

IC1

Q190

Q50

D101

IC10

IC5

IC2

Q11

Q51

Q52

1

PC BOARD (COMPONENT SIDE VIEW)

2

3

4

5

6

7

X14-6880-2x

IC Q

14D 24C 43A 52D

6

Address

IC Q

62E 71C

10 3C

Address

IC Q

Address 11 3C 41 5B 50 3C 51 3C

IC Q

222 6B 223 5B 224 5B 251 3B

Address

IC Q

Address 501 2E 551 5D 552 5D

IC Q

52 3C

Address

190 6E 191 3E 221 5B

Refer to the schematic diagram for the v alues of resistors and capacitors.